Online Education For Gem Enthusiasts
- 9,142 Members
- 2,328 Articles
- 145 Gemology Businesses
- 155,216 Facebook fans
Ways to Start Your Gemology Education
Join Our Thriving Community
The world's best gem articles, published weekly.
Most Recent Articles
Table of Refractive Indices and Double Refraction of Selected Gems
Refractive indices and double refraction (birefringence) help gemologists identify gems. The following table lists these values for selected gemstones.
Sugilite Value, Price, and Jewelry Information
What is the color of sugilite? Grape jelly purple is a good description. More popular among consumers in Asia than North America, this is a very rare and beautiful opaque gem material with an unusual appearance.
Pear-Shaped Diamond Guide: Unique & Stylish
Dreaming of a pear-shaped diamond engagement ring? Learn the pros and cons and read our expert advice to find the perfect pear for your style and budget!
Is a D Color Flawless Diamond Worth the Price?
A D color flawless diamond has the highest color and clarity grade — and the biggest price tag. Are these premium diamonds worth the extra money?
Rose Quartz Value, Price, and Jewelry Information
A popular variety of colored quartz, rose quartz makes a durable jewelry stone. Although commonly cabbed and carved, more transparent material can also be faceted.
Gemstone Certificates
Can you rely on gemstone certificates to reveal everything that can affect the value of pricey gems? Learn what to look for when you have a gem certified.
Become a Gemology Pro
Sign up for a Pro Membership"Becoming a Pro Member of IGS just made good sense for my business. The gemology resources are fantastic, and my profile lets potential customers know I am serious about colored gemstones. And frankly, if I get any exposure to potential customers it's a no-brainer."Paul Bierker, Paul Michael Designs
Jeweler, IGS Pro Member
